Removed :usage() hooks for arguments and options

spec/usage_spec.lua

@@ -131,18 +131,6 @@ describe("tests related to usage message generation", function()
          )
       end)
 
-      it("uses per-option message provided by user", function()
-         local parser = Parser "foo"
-            :add_help(false)
-         parser:flag "-q" "--quiet"
-            :usage "[-q | --quiet]"
-
-         assert.equal(
-            [=[Usage: foo [-q | --quiet]]=],
-            parser:get_usage()
-         )
-      end)
-
       it("uses argnames provided by user", function()
          local parser = Parser "foo"
             :add_help(false)

src/argparse.lua

@@ -170,7 +170,6 @@ do -- Create classes with setters
       default = typecheck.string "default",
       defmode = typecheck.string "defmode",
       convert = convert,
-      usage = typecheck.string "usage",
       argname = typecheck.string "argname"
    })
 
@@ -191,7 +190,6 @@ do -- Create classes with setters
       convert = convert,
       overwrite = typecheck.boolean "overwrite",
       action = typecheck["function"] "action",
-      usage = typecheck.string "usage",
       argname = typecheck.string "argname"
    })
 end
@@ -229,10 +227,6 @@ function Argument:_get_arg_usage(argname)
 end
 
 function Argument:_get_usage()
-   if self._usage then
-      return self._usage
-   end
-
    local usage = table.concat(self:_get_arg_usage("<" .. self._name .. ">"), " ")
 
    if self._default and self._defmode:find "u" then
@@ -265,10 +259,6 @@ function Argument:_get_type()
 end
 
 function Option:_get_usage()
-   if self._usage then
-      return self._usage
-   end
-
    local usage = self:_get_arg_usage("<" .. self:_get_target() .. ">")
    table.insert(usage, 1, self._name)
    usage = table.concat(usage, " ")